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phy of me of sem of 1
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  Physics UNIT  –  III FIBRE OPTICS AND ITS APPLICATIONS   PART  –  A ( 2 Marks)  1. What is meant by Total Internal Reflection? 2. What are the conditions to be satisfied for total internal reflection? 3. Define acceptance angle and numerical aperture. 4. Distinguish between step index and graded index fibres. 5. What are the losses in optical fibres? 6. Mention any two fiber optic sources? 7. What is meant by photo detector? 8. What are the types of sensors used in the fiber optics? 9. What is called medical endoscope? 10. Mention the advantages of optical fiber communication over radio wave communication. 11. Mention some of the medical applications of optical fibres. 12. Mention some of the engineering applications of optical fibres. 13. The refractive indices of core and cladding materials of an optical fibre are 1.54 and 1.5 respectively. Calculate the numerical aperture of the optical fiber 14. Estimate NA when core refractive index is 1.48 , relative refractive index is 2 %. Also calculate the critical angle. 15. A fibre has a diameter of 6 μ m and its core refractive index is 1.47 and for cladding it is 1.43 . How many modes can propagate into the fibre if the wavelength of the laser source is 1.5 μ m . PART  –  B ( 16 MARKS) 1. a) Derive an expression for Numerical Aperture and angle of acceptance of a fibre in terms of refractive indices of the core and cladding (10) b) Describe the Crucible-Crucible technique for manufacturing an optical fibre (6) 2. a) What are different types of optical fibres? (8) b) Explain about losses in an optical fibre (8) 3. a) Explain with a neat block diagram of fibre optical communication system (8) b) Explain about LED and Avalanche Photo diode used in fibre optics (8) 4. a) What are different types of optical sensors? Explain the working of any two  sensors (4+6) b) Describe the construction and working of a fiber optic endoscope and give its applications in medicine (6)    UNIT  –  IV : QUANTUM PHYSICS PART  –  A ( 2 Marks) 1. What is a black body? 2. What are the postulates of planks quantum theory? 3. What is meant by matter waves? 4. What is called Compton shift? 5. What is the physical significance of a wave function? 6. Define magnifying power. 7. Define resolving power of a microscope. 8. What is wave function? 9. Mention the applications of electron microscope. 10. Write down the one dimensional schroedinger time independent wave equation. 11. An electron at rest is accelerated through a potential of 5000 V. Calculate the de-Broglie wavelength of matter waves associated with it. 12. Find the change in wavelength of an X-ray photon when it is scattered through an angle of 1350 by a free electron. 13. Calculate the minimum energy of an electron can possess in an infinitely deep potential well of width 4nm. 14. What is meant by degenerate and non-degenerate states? 15. Differentiate between optical microscope and electron microscope. PART  –  B ( 16 MARKS) 1. a) What is meant by black body radiation ? (2) b) Using quantum theory derive an expression for the average energy emitted by the black body and deduce Wien’s displacement law and Rayleigh  – Jeans law (10 +4) 2. a) Define Compton Effect? (2) b) Derive an expression for the wavelength of the scattered photon (Compton Shift) (14) 3. a) Derive time independent Schroedinger wave equation (8) b) Solve Schroedinger wave equation for a particle in a one dimensional box and energy eigen value. (8) 4. a) Derive the equation for Schroedinger time  –  dependent wave equation (6) b) Explain about Electron Microscope with a neat diagram (10)
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